import java.io.ByteArrayOutputStream; 
import java.util.Random; 
import java.util.Arrays; 
import javax.xml.bind.DatatypeConverter; 
  
public class Base64
{
  public static String encode(String text)
    {
    byte[] data = text.getBytes();
    return encode(data);
  }
  
  public static String encode(byte[] data) {
    char[] tbl = {
    'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P',
    'Q','R','S','T','U','V','W','X','Y','Z','a','b','c','d','e','f',
    'g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v',
    'w','x','y','z','0','1','2','3','4','5','6','7','8','9','+','/' };
    
    StringBuilder buffer = new StringBuilder();
    int pad = 0;
    for (int i = 0; i < data.length; i += 3) {
      
      int b = ((data[i] & 0xFF) << 16) & 0xFFFFFF;
      if (i + 1 < data.length) {
        b |= (data[i+1] & 0xFF) << 8;
      } else {
        pad++;
      }
      if (i + 2 < data.length) {
        b |= (data[i+2] & 0xFF);
      } else {
        pad++;
      }
      
      for (int j = 0; j < 4 - pad; j++) {
        int c = (b & 0xFC0000) >> 18;
        buffer.append(tbl[c]);
        b <<= 6;
      }
    }
    for (int j = 0; j < pad; j++) {
      buffer.append("=");
    }
    
    return buffer.toString();
  }

  
  public static String decodeStr(String data)
    {
      return new String(decode(data));
    }
    
    public static byte[] decode(String data)
    {
    int[] tbl = {
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54,
    55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1, -1, 0, 1, 2,
    3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
    20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30,
    31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
    48, 49, 50, 51, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 };
      byte[] bytes = data.getBytes();
      ByteArrayOutputStream buffer = new ByteArrayOutputStream();
        for (int i = 0; i < bytes.length; ) {
        int b = 0;
        if (tbl[bytes[i]] != -1) {
      b = (tbl[bytes[i]] & 0xFF) << 18;
        }
        // skip unknown characters
      else {
      i++;
      continue;
      }
        
        int num = 0;
      if (i + 1 < bytes.length && tbl[bytes[i+1]] != -1) {
      b = b | ((tbl[bytes[i+1]] & 0xFF) << 12);
        num++;
        }
      if (i + 2 < bytes.length && tbl[bytes[i+2]] != -1) {
      b = b | ((tbl[bytes[i+2]] & 0xFF) << 6);
        num++;
        }
      if (i + 3 < bytes.length && tbl[bytes[i+3]] != -1) {
      b = b | (tbl[bytes[i+3]] & 0xFF);
      num++;
        }
        
        while (num > 0) {
        int c = (b & 0xFF0000) >> 16;
      buffer.write((char)c);
      b <<= 8;
    num--;
    }
  i += 4;
}
    return buffer.toByteArray();
  }
}